Three potent earthquakes off Russia's far east coast triggered a tsunami warning on Sunday, according to the US Geological Survey.

The larger quake was at a depth of 20 kilometers and was 144 kilometers east of the city of Petropavlovsk-Kamchatsky, which has a population of 180,000.

A major earthquake this week has parts of the United States and other countries on high alert for a potential tsunami. On Wednesday, a 7.2 magnitude earthquake was detected 50 miles south of the Alaskan island-city of Sand Point.